This article was previously published under Q274274
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If the file server for a computer-assigned package is in a different forest, the assignment is not successful, and you receive error "1612":
The installation source for this product is not available. Verify that the source exists and that you can access it.
One event ID which corresponds to this issue is:
Source: Application Management Event ID 102 The install of application "<Package Name>" from policy "<Policy Name>" failed. The error was "The installation source for this product is not available. Verify that the source exists and that youcan access it."
Permissions to the file, and share were assigned to the computer account. This behavior is by design because Windows NT LAN Manager (NTLM), not Kerberos, is used when authenticating between forests. Therefore, no computer account authentication takes place, and the package cannot be accessed. If the source files are being stored on a Windows NT 4.0 or Windows 2000 Cluster server, it will only use NTLM for authentication. Machine accounts require Kerberos for authentication; therefore the source files cannot be stored on a Windows NT 4.0 or Windows 2000 Cluster Server.
Assign permissions to authenticated users on the file, and share permissions that contain the medium-scale integration (MSI) package.
This behavior is by design.
For additional information, click the article number below to view the article in the Microsoft Knowledge Base:
278472 Packages Assigned to Computers with Group Policy Are Not Installed